EP3694055A1

EP3694055A1 - Connector assembly

Info

Publication number: EP3694055A1
Application number: EP20156409.3A
Authority: EP
Inventors: P.K. Senthil Kumar; Ugo Aime
Original assignee: TE Connectivity India Pvt Ltd; TE Connectivity Italia Distribution SRL
Current assignee: TE Connectivity India Pvt Ltd; TE Connectivity Italia Distribution SRL
Priority date: 2019-02-11
Filing date: 2020-02-10
Publication date: 2020-08-12
Also published as: US20200259279A1; US11121488B2; CN111555057A

Abstract

The present invention relates to a circuit carrier having a first surface and an opposing second surface. The assembly further comprises at least one first sub-assembly, which is detachably connected to the first surface of the circuit carrier, and, at least one-second sub-assembly, which is detachably connected to the second surface of the circuit carrier, wherein the circuit carrier has at least one electrically conductive lead interconnecting the first and the second sub-assembly.

Description

The present disclosure relates to an assembly for electrical devices that demand a compact and automated solution to transfer power from a power source. The assembly of the present disclosure comprises a circuit carrier and a first sub-assembly and a second sub-assembly connected through an electrical conductive lead on the circuit carrier with the first sub-assembly.
As the number of electrical appliances increases, the use of small electrical motors also increases. Motors are typically incorporated into appliances such as vacuum cleaners, kitchen appliances, and any other power accessory used in home or business.
Magnetic wires are typically connected to terminals having insulation displacement slots, such as the terminals from Applicant's Mag-Mate electrical connectors. The terminals have two insulation displacement slots that cut through the tough outer varnish coating on the magnetic wires providing good electrical connection to the magnetic wire. The Mag-Mate terminal can either be connected to a plug terminal, for example by a leaf spring contact or, alternatively, be connected to a receptacle terminal, for example, by an integral tab contact extending in the opposite direction of the insulation displacement slots.
Quick disconnects have been used by several different industries for more than 70 years. Billions of these terminals are in service today. Their applications range from appliances to automotive wire harnesses, and include high-temperature designs, electric motors and power supplies controls. These terminals continue to be the standard for wiring electrical components since they remain unsurpassed in meeting the basic mechanical and electrical requirements of many applications.
While in the past typical wire range demand was between 0.2 and 2.0 mm diameter expressed in American Wire Gauge units [AWG 32 and 12], today's market also requires connections with fine wire (below 0.18 mm diameter, AWG 33) and large wire (above 3.0 mm diameter, AWG 9). Fine wire is utilized to reduce costs and also to comply with more compact design requirements. Therefore, not only the wire, but also the connection system, must have smaller dimensions to fit in areas where space is a premium.
At the other end of the scale, there is ever-increasing demand for low voltage power across many different applications. Of course, the lower voltages require higher current to deliver the required power, and larger wire is then necessary to carry the higher electrical current. The growth of applications using low voltage power is a steady, undeviating trend: more automation, more cordless devices, more battery packs, more lighting -the list goes on and on.
Another trend that continues to gain momentum, regardless of wire size, is a focus on innovation to effectively manage assembly costs while improving quality and consistency in the connection process. Above all, wire connections and terminations must be reliable. With the high risks of field failures, as well as the possibility of damage to reputation and customer relations, original equipment manufacturers (OEMs) are placing a priority on serving customers with high quality products. Higher quality products and processes can translate into lower costs for the OEMs.
Typical termination technologies are welding and soldering processes. While effective, these thermal processes can be difficult to control. They also require high temperatures that may damage the wire or components, and they require time-consuming mechanical or chemical processes to strip the magnet wire.
Nowadays, to better meet different technological demands different connection technologies must be investigated that will allow to reduce the risks of failure and that will allow engineers to design reliable products that perform well.
For the magnetic terminals to interconnect with circuit carrier, various means for lead connection have been provided, such as poke-in latches for directly receiving the wire, tabs for receptacle terminals, posts for wrapping wire thereabout, wire barrels or solder tabs. Contacts of this type have performed admirably and offer many advantages. However, with these prior art terminals for connecting magnetic wires to lead wires, it has been difficult to effectively connect the magnetic wires to harnesses and the like, which are used in appliances and other such devices. Therefore, as the industry becomes more and more sophisticated, it becomes necessary to provide electrical contacts that further enhance the assembly processes of components and allows for ease of repair and replacement. In addition, as the complexity of the electrical appliances and the like increases, it is beneficial to connect the motor and components in series through the use of harnesses. However, due to the configuration of the magnetic wire terminals, circuit carrier, and the quick disconnects detachably affixed onto the circuit carrier, the connection of the harnesses to the terminals has been difficult.
It would, therefore be beneficial to provide an assembly which allows the magnetic terminals and quick disconnects to be easily and effectively connected to the circuit carrier. In so doing, the harnesses may be easily disconnected and reconnected to allow for ease of repair or replacement of the individual components. Furthermore, such an assembly also obviates the need of soldered connection and thereby provides a compact and an automated solution for transforming the power.
Other technical advantages may become readily apparent to one of ordinary skill in the art after a review of the following figures and description.
In one of the general aspects provided is an assembly for electrical connection, the assembly comprising a circuit carrier having a first surface and an opposing second surface. The assembly further comprises at least one first sub-assembly, which is detachably connected to the first surface of the circuit carrier, and, at least one-second sub-assembly, which is detachably connected to the second surface of the circuit carrier, wherein the circuit carrier has at least one electrically conductive lead interconnecting the first and the second sub-assembly.
In another exemplary embodiment of the assembly, the first sub-assembly and the second sub-assembly comprises at least one compliant pin.
In another exemplary embodiment of the assembly, the compliant pin engages with a virgin area of each plated through hole on the circuit carrier when electrically connected therein.
In another exemplary embodiment of the assembly, second sub-assembly comprises a cavity and a receptacle.
In another exemplary embodiment of the assembly, the compliant pin of the second sub-assembly is arranged to protrude perpendicular to the receptacle.
In another exemplary embodiment of the assembly, the compliant pin of the second sub-assembly is a multispring.
In another exemplary embodiment of the assembly, the compliant pin of the second assembly is connected perpendicularly to the conductive lead on the circuit carrier.
In another exemplary embodiment of the assembly, the compliant pin of the first sub-assembly is an action pin.
In another exemplary embodiment of the assembly the second sub-assembly adapted to receive at least one conductor.
In another exemplary embodiment of the assembly, the receptacle is adapted to establish an electrical contact by displacement of an insulation on the conductor.
In another exemplary embodiment of the assembly, the cavity comprises plastic material.
In another exemplary embodiment of the assembly, the first sub-assembly is provided with a fin adapted to connect with a mating contact.
In another exemplary embodiment of the assembly, the first sub-assembly is provided with at least three compliant pins.
In another exemplary embodiment of the assembly, the circuit carrier is a printed circuit board.
In another exemplary embodiment of the assembly, the second assembly is a flat, quickly disconnectable tab, as for instance sold under the name "FASTON".
Additional benefits and advantages of the disclosed embodiments will become apparent from the specification and drawings. The various embodiments and features of the specification and drawings may individually obtain the benefits and/or advantages, which need not all be provided in order to obtain one or more of such benefits and/or advantages.
The invention is explained in detail below with references to embodiments and the appended drawings. Elements or components, which have an identical, univocal or similar construction and/or function, are referred to in various Figures of the drawings with the same reference numerals.
Unless otherwise specifically noted, articles depicted in the drawings are not necessarily drawn to scale.
In the detailed Figures of the drawings:

Fig. 1: is a schematic view of the embodiment of an assembly in detached state according the present disclosure,
Fig 2: is a schematic view of the embodiment of an assembly according to Figure 1 in an attached state according to the present disclosure.

It should be understood at the outset that, although exemplary embodiments are illustrated in the figures and described below, the principles of the present disclosure may be implemented using any number of techniques, whether currently known or not. The present disclosure should in no way be limited to the exemplary implementations and techniques illustrated in the drawings and described below.
More specific embodiments of the present disclosure are described below. Note, however, that an excessively detailed description may be omitted. For example, a detailed description of an already well-known matter and a repeated description of substantially identical components may be omitted. This is intended to avoid unnecessary redundancies of the following description and facilitate understanding of persons skilled in the art. It should be noted that the inventors provide the accompanying drawings and the following description so that persons skilled in the art can fully understand the present disclosure, and that the accompanying drawings and the following description are not intended to limit the subject matters recited in the claims. In the following description, identical or similar constituent elements are given the same reference numerals.
Next, an assembly according to the present disclosure is described with reference to Figure 1. The assembly 1 comprises a first sub-assembly 12 and a second sub-assembly 13 which are arranged to detachably connect with a circuit carrier 11. The first sub-assembly 12 comprises a plurality of quick disconnects having a fin shaped portion 12-2. Each of the quick disconnects comprises a plurality of compliant pins 12-1. The pins 12-1 can be of various types, for example, multispring, action-pin, eye of needle.
Preferably, the first sub-assembly is a Faston PCB terminal. The second sub-assembly 13 comprises of a receptacle 13-1 and a cavity 13-2. The cavity 13-2 is adapted to receive conducting wires. The receptacle 13-1 comprises compliant pins 13-3 protruding perpendicular to the receptacle 13-1. The compliant pins 13-3 can be of various types, for example, multispring, action-pin, eye of needle. Preferably, the compliant pins 13-3 are of the multispring type. And in a preferred embodiment, the receptacle 13-1 is magnetic wire terminal. The conducting wires which have an insulation are received in the cavity 13-2. The magnetic wire terminal 13-1 forces a selectively sharpened blade through the insulation, bypassing the need to strip the conductors of insulation by displacement before connecting the magnetic wire terminal 13-1 with the conducting wires.
Next, details of the insulation displacement technology is described. Preferably, the receptacle 13-1 of the second sub-assembly connects with the magnetic wire terminals received in the cavity 13-2 by displacing the insulation on the wires. Insulation displacing wire termination methods use in a variety of applications. This termination technique is successfully used in many industries where mass termination of multiple contacts is cost effective. There exists in parallel -and completely equivalent-the two terms "Insulation Displacement Technology (IDT)" and "Insulation Displacement Connection (IDC)". Both terms describe very precisely the mating principle.
Independent from the design of the electrically conductive part of a cable, the cable insulation is penetrated by means of needles or stripping shoulders such as a V-and/or U-shaped contact element and/or shifted in mating direction. At the same time the electrical connection between the cable and the contact element is made. The relative motion between contact element and cable, which is also called assembly process and necessary for the manufacturing of the electrical connection, will be realized in dependence on the design of the connector in different kinds: (a) with a fixed conductor the contact element is relatively moved to this conductor, (b) with a fixed contact element the conductor is inserted from above into the insulation displacement slot.
On the one hand, this can be realized by means of the connector cover. On the other hand, there is the possibility of pressing the wire directly into the insulation displacement slot, whereby in this case (during assembly) the function of the above described cover is replaced in the manufacturing tool by special dies.
During the assembly process, the wire insulation is separated and the V-/U-shaped sides of the contact element are pressed against the conductor. Due to the high spring force of the insulation displacement slot, the conductor is slightly deformed and/or the stranded interconnection is realigned in its position.
Thus, two opposite contact areas result in the insulation displacement slot. The contact areas between insulation displacement slot and conductor show a gas-proof connection, which prevent the penetration of corrosive gases into the electrical connection. In order to guarantee the gas density during the entire product life, the necessary contact pressure between cutting clearance and conductor must be always above a minimum value. The consequence of a declining gas density would be an increased transition resistance, which would lead again to increased temperatures in the connector. As this process-during constant electrical load-will build up, this would lead inevitably to a thermal overloading of the connector.
The first sub-assembly 12 is connected through the electrical leads 14 on the circuit carrier with the second sub-assembly 13. Each of the compliant pins (12-1, 13-3) of the first and the second sub-assembly are connected to a virgin area of the circuit carrier.
Preferably, the circuit carrier is a printed circuit board. The compliant pins are detachably attached to the circuit carrier and thus offer a compact and automated solution for power transfer.
The first sub-assembly according the present disclosure further includes Faston tab 12. The Faston tabs are quick disconnects that have a fin 12-2 which can be mated with a mating contact to establish an electrical connection. The metallic terminals of the Faston tab type or the like are crimped onto the metallic conductors of the mating contact and, being complementarily shaped, can therefore be mated with the preceding ones; said mating contact, when mutually mated with Faston tab 12 produce the continuity that carries the electric current.
Figure 2 shows the connected state of the first sub-assembly 12 and the second sub-assembly 13 in contact with the circuit carrier. The compliant pins 13-3 of the second sub-assembly detachably attaches with the through holes of the circuit carrier 11 perpendicularly to the direction of the electrical leads 14 on the circuit carrier 11, so as to establish a contact with the first sub-assembly 12. The compliant pins are electronic connectors that are suitable for detachably joining the first and the second sub-assemblies.
Electronic connectors are frequently used in automotive electronics and telecommunication equipment. Due to the harsh application environments, fretting wear is one of the commonly seen causes of their premature failures. Fretting induces wear and corrosion, which could cause the gradual loss of normal contact force and increase of electrical contact resistance between the contact pair. Action-pin, multispring, and eye of needle are preferably used to contact the first 12 and the second sub-assembly 13 with the circuit carrier 11. Such compliant pins are less prone to fretting compared to commonly used Blade/receptacle compliant pins.
As can be understood from the above, in the present embodiment, the use of the complaint pins is effective in the automated solution for power transfer as they are detachably connected to the circuit carrier.
The above explanations are examples of preferred embodiments of the present disclosure, and the scope of the present disclosure is not limited thereto. For example, in the above explanation about the embodiments, the present disclosure is applied to the telecommunication devices. However, the present disclosure is not limited thereto. The present disclosure can be applied to any suitable power source that transfer power to a coil. The embodiments of the present disclosure using compliant pin variants can eliminate soldering processes and offers a compact solution that can be automated. Such an assembly needs minimal intervention.
Modifications, additions, or omissions may be made to the systems, apparatuses, and methods described herein without departing from the scope of the disclosure. For example, the components of the systems and apparatuses may be integrated or separated. Moreover, the operations of the systems and apparatuses disclosed herein may be performed by more, fewer, or other components and the methods described may include more, fewer, or other steps. Additionally, steps may be performed in any suitable order. As used in this document, "each" refers to each member of a set or each member of a subset of a set.

While the present disclosure has been, in particular, shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from intent of the disclosure as defined by the appended claims. The exemplary embodiments should be considered in descriptive sense only and not for purposes of limitation. Therefore, the scope of the present disclosure is defined not by the above description of the invention but by the appended claims, and all differences within the scope will be construed as being included in the present invention.

List of reference numerals

Reference Numeral	Description
1, 2	Assembly
12	First sub-assembly
13	Second sub-assembly
12-1	Compliant pins of the first sub-assembly
12-2	Fins of the first sub-assembly
11	Circuit carrier
14	Electrical leads on the circuit carrier
13-1	Receptacle of the second sub-assembly
13-2	Cavity of the second sub-assembly
13-3	Compliant pins of the second sub-assembly

Claims

A assembly for electrical connection, the assembly comprising:
a circuit carrier having a first surface and an opposing second surface,

at least one first sub-assembly which is detachably connected to the first surface of the circuit carrier and,

at least one second sub-assembly which is detachably connected to the second surface of the circuit carrier,

wherein the circuit carrier has at least one electrically conductive lead interconnecting the first and the second sub-assembly.
The assembly according to claim 1, wherein the first sub-assembly and the second sub-assembly comprises at least one compliant pin.
The assembly according to claim 2, wherein the compliant pin engages with a virgin area of each of a plated through hole on the circuit carrier when electrically connected therein.
The assembly according to claim one of the preceding claims, wherein second sub-assembly comprises a cavity and a receptacle
The assembly according to claim 4, wherein the cavity comprises a plastic material.
The assembly according to one of the claims 2 to 4, wherein the compliant pin of the second sub-assembly is arranged to protrude perpendicular to the receptacle.
The assembly according claim 6, wherein the compliant pin of the second sub-assembly is a Multispring™.
The assembly according to claim 7, wherein the compliant pin of the second assembly is connected perpendicularly to the conductive lead on the circuit carrier.
The assembly according to one of the claims 2 to 7, wherein the compliant pin of the first sub-assembly is an ACTION PIN™.
The assembly according to one of the preceding claims, wherein the second sub-assembly is adapted to receive at least one conductor.
The assembly according to claim 10, wherein the receptacle is adapted to establish an electrical contact by displacement of an insulation on the conductor.
The assembly according to one of the preceding claims, wherein the first sub-assembly is provided with a fin adapted to connect with a mating contact.
The assembly according to one of the preceding claims, wherein the first sub-assembly is provided with at least two, preferably three compliant pins.
The assembly according to one of the preceding claims, wherein the circuit carrier is a printed circuit board.
The assembly according to one of the preceding claims, wherein the second assembly is a flat, quickly disconnectable tab.